US20150171680A1 - Interior permanent magnet rotary electric machine - Google Patents

Interior permanent magnet rotary electric machine Download PDF

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Publication number
US20150171680A1
US20150171680A1 US14/406,970 US201314406970A US2015171680A1 US 20150171680 A1 US20150171680 A1 US 20150171680A1 US 201314406970 A US201314406970 A US 201314406970A US 2015171680 A1 US2015171680 A1 US 2015171680A1
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US
United States
Prior art keywords
armature
permanent magnet
electric machine
rotary electric
magnetic pole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/406,970
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English (en)
Inventor
Nobuyuki Kifuji
Yoshinari Asano
Shintarou Araki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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Filing date
Publication date
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Assigned to DAIKIN INDUSTRIES, LTD. reassignment DAIKIN INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARAKI, SHINTAROU, ASANO, YOSHINARI, KIFUJI, NOBUYUKI
Publication of US20150171680A1 publication Critical patent/US20150171680A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/2713—Inner rotors the magnetisation axis of the magnets being axial, e.g. claw-pole type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present invention relates to a so-called interior permanent magnet rotary electric machine where a permanent magnet is embedded in a field element.
  • An interior permanent magnet rotary electric machine is a desirable rotary electric machine from a view point that so-called reluctance torque is used.
  • various shapes including shapes exemplified in International Publication No. 2008/114692, Japanese Patent Application Laid-Open No. 2011-91911, Japanese Patent Application Laid-Open No. 11-206075 (1999) and Japanese Patent Application Laid-Open No. 2003-47212 have been proposed.
  • an embedded type rotary electric machine to increase a field magnetic flux so as to increase an output of the embedded type rotary electric machine, it is desirable to increase a surface area of a magnetic pole face of a permanent magnet which generates the field magnetic flux.
  • a shape of the magnetic pole face of the permanent magnet is concaved toward an armature as viewed from the direction parallel to a rotation axis which is the center of rotation of the rotary electric machine.
  • Such a shape is described in Japanese Patent Application Laid-Open No. 11-206075 (1999) and Japanese Patent Application Laid-Open No. 2003-47212, for example.
  • Japanese Patent Application Laid-Open No. 11-206075 (1999) and Japanese Patent Application Laid-Open No. 2003-47212 also exemplify a manufacturing method when a resin magnet is used as the permanent magnet.
  • armature magnetic field a magnetic field generated by an armature winding
  • armature magnetic field a magnetic field generated by an armature winding
  • both ends of the permanent magnet are disposed closer to the armature than a center portion of the permanent magnet and hence, both ends of the permanent magnet are liable to be demagnetized.
  • an object of the present invention to provide an interior permanent magnet rotary electric machine having the structure which makes the effects of the demagnetization caused by an armature magnetic field difficult while increasing areas of the magnetic pole faces of the permanent magnet.
  • An interior permanent magnet rotary electric machine includes: an armature ( 1 , 19 ); and a field element ( 2 , 29 ) rotating relative to the armature about a rotation axis (J) which constitutes the center of rotation.
  • the field element includes: a core ( 21 ); and a plurality of permanent magnets ( 22 , 221 , 222 , 223 , 229 ) extending in the axial direction which is the direction parallel to the rotation axis and embedded in the core.
  • Each of the plurality of permanent magnets has a pair of magnetic pole faces ( 22 a , 22 b , 221 a , 221 b , 222 a , 222 b , 223 a , 223 b , 229 a , 229 b ) which show arcs concaved toward the armature as viewed from the axial direction.
  • a radius (R2, R4, R6, R29) of a second arc which is the arcs shown by the magnetic pole face ( 22 b , 221 b , 222 b , 223 b , 229 b ) away from the armature out of the pair of magnetic pole faces is larger than a radius (R1, R3, R5, R19) of a first arc which is the arcs shown by the magnetic pole face ( 22 a , 221 a , 222 a , 223 a , 229 a ) close to the armature out of the pair of magnetic pole faces, in the each of the plurality of permanent magnets.
  • a focal point (P2, P4, P6, P29) of the second arc is further away from the permanent magnet than a focal point (P1, P3, P5, P19) of the first arc.
  • the focal point of the second arc is closer to the permanent magnet than a focal point of the first arc.
  • the focal point of the first arc, the focal point of the second arc and the rotation axis in the each of the plurality of permanent magnets are arranged on one straight line as viewed from the axial direction.
  • a second aspect of the interior permanent magnet rotary electric machine according to the present invention is, in the first aspect of the interior permanent magnet rotary electric machine, characterized in that the field element ( 2 ) further includes a magnetic barrier ( 23 ) mounted on an end portion different from the pair of magnetic pole faces in one of the plurality of permanent magnets.
  • a third aspect of the interior permanent magnet rotary electric machine according to the present invention is, in the second aspect of the interior permanent magnet rotary electric machine, characterized in that a length ( 23 c ) formed by the magnetic barrier at a position remotest from the end portion and a side surface ( 210 ) of the core closest to the armature ( 1 ) is smaller than a width ( 22 d ) on the one straight line in the one of the plurality of permanent magnets.
  • a fourth aspect of the interior permanent magnet rotary electric machine according to the present invention is, in any one of the first to third aspects of the interior permanent magnet rotary electric machine, characterized in that the plurality of permanent magnets include a plurality of permanent magnets ( 221 , 222 , 223 ) stacked between the rotation axis and the armature.
  • a fifth aspect of the interior permanent magnet rotary electric machine according to the present invention is, in any one of the first to fourth aspects of the interior permanent magnet rotary electric machine, characterized in that the plurality of permanent magnets are formed of resin magnets.
  • a sixth aspect of the interior permanent magnet rotary electric machine according to the present invention is, in the fifth aspect of the interior permanent magnet rotary electric machine, characterized in that a magnetization magnetic flux supplied from the outside for obtaining the resin magnet at the time of forming the resin magnets by injection molding is set parallel to the one straight line as viewed from the axial direction.
  • a seventh aspect of the interior permanent magnet rotary electric machine according to the present invention is, in the fifth aspect of the interior permanent magnet rotary electric machine, characterized in that the resin magnets are formed by injection molding, and have anisotropy such that the thickness direction of the plurality of permanent magnets becomes the magnetization easy axis.
  • An eighth aspect of the interior permanent magnet rotary electric machine according to the present invention is, in any one of the first to seventh aspects of the interior permanent magnet rotary electric machine, characterized in that the armature ( 1 ) has an armature winding ( 12 ) wound by concentrated winding.
  • the magnetic pole face of the permanent magnet is concaved toward the armature setting the thickness of the permanent magnet such that the thickness is large in the vicinity of end portions which differ from the pair of magnetic pole faces and the thickness of the permanent magnet is thin in the vicinity of the center of the permanent magnet.
  • the effect of demagnetization caused by the armature magnetic field is decreased while increasing an area of the magnetic pole face of the permanent magnet and, a volume of the magnet is reduced.
  • the second aspect of the interior permanent magnet rotary electric machine of the present invention it is possible to prevent a magnetic flux from flowing in a short-circuited manner between the pair of magnetic pole faces of the permanent magnet.
  • the third aspect of the interior permanent magnet rotary electric machine of the present invention it is possible to prevent a magnetic barrier from impairing advantageous effects brought about by the first aspect of the interior permanent magnet rotary electric machine when the rotary electric machine is stopped.
  • reluctance torque of the rotary electric machine is increased.
  • the fifth aspect of the interior permanent magnet rotary electric machine of the present invention it is easy to provide the permanent magnet in the core by injection molding.
  • the eighth aspect of the interior permanent magnet rotary electric machine of the present invention it is resist to the demagnetization even at the armature which adopts concentrated winding by which demagnetization of the permanent magnet is liable to be generated.
  • FIG. 1 is a cross-sectional view showing the constitution of a rotary electric machine according to a first embodiment
  • FIG. 2 is a cross-sectional view showing the constitution of a conventional field element
  • FIG. 3 is a cross-sectional view showing the constitution of a field element of a rotary electric machine according to the first embodiment
  • FIG. 4 is a cross-sectional view showing the constitution of a field element of a rotary electric machine according to a second embodiment
  • FIG. 5 is a cross-sectional view showing the constitution of the field element of the rotary electric machine according to the second embodiment
  • FIG. 6 is a cross-sectional view showing the constitution of the field element of the rotary electric machine according to the second embodiment
  • FIG. 7 is a cross-sectional view showing the constitution of the field element of the rotary electric machine according to the second embodiment
  • FIG. 8 is a cross-sectional view showing the constitution of a rotary electric machine according to a fourth embodiment.
  • FIG. 9 is a cross-sectional view showing the constitution of a field element of a rotary electric machine according to a fifth embodiment.
  • a rotary electric machine is a so-called inner rotor type rotary electric machine where the rotary electric machine includes a field element 2 , and an armature 1 which surrounds the field element 2 .
  • the field element 2 rotates relative to the armature 1 about a rotation axis J which constitutes the center of rotation.
  • FIG. 1 is a cross-sectional view of the rotary electric machine taken on a plane perpendicular to the rotation axis J as viewed in the direction parallel to the rotation axis (hereinafter, referred to as “axial direction”).
  • the field element 2 includes a core 21 and a plurality of permanent magnets 22 which are embedded in the core 21 .
  • the permanent magnets 22 extend in the axial direction (in the direction perpendicular to a surface of paper on which FIG. 1 is drawn). Each permanent magnet 22 is concaved toward the armature 1 as viewed in the axial direction.
  • the armature 1 has teeth 11 , an armature winding 12 and a yoke 13 .
  • the yoke 13 connects the teeth 11 on a side opposite to the field element 2 .
  • the armature winding 12 is wound around the teeth 11 by concentrated winding.
  • a demagnetization effect becomes conspicuous for the field element 2 .
  • the armature winding 12 does not mean the individual conductive wires which constitute the armature winding 12 but means collective conducive wires in a mode where the conductive wires are wound in a bundle. It is also applied to attached drawings. Lead lines on a winding start side and lead lines on a winding finish side, and connecting them is also omitted from the drawing.
  • FIG. 2 shows the structure of a conventional field element for reference. In FIG. 2 , however, only a portion of the cross section of the structure perpendicular to the axial direction is shown.
  • a permanent magnet 22 is embedded in a core 21 , a magnetic pole face 22 a close to an armature (not shown in the drawing: see FIG. 1 ) and a magnetic pole face 22 c away from the armature each has an arc. As described previously, it is for the sake of increasing areas of the magnetic pole faces.
  • a radius R02 of an arc shown by the magnetic pole face 22 c is larger than a radius R01 of an arc shown by the magnetic pole face 22 a as viewed in the axial direction, and both focal points of these arcs are set at a focal point P0. That is, the magnetic pole faces 22 a , 22 c respectively show the arcs which are portions of concentric circles as viewed in the axial direction. Accordingly, a distance between the magnetic pole faces 22 a , 22 c , that is, a thickness of the permanent magnet 22 (R02-R01) becomes uniform.
  • the difference between radii (R02-R01) can be increased so as to make the demagnetization caused by the armature difficult.
  • the demagnetization of the permanent magnet 22 in the vicinity of the center of the arc is not so large as that of both ends of the arc. Accordingly, the mere increase of the difference between the radii (R02-R01) excessively increases the volume of the permanent magnet 22 thus impeding the effective use of the permanent magnet 22 .
  • the thickness of the permanent magnet 22 is small at the substantially center of the arc and large at both end portions of the arc.
  • FIG. 3 shows the constitution of the field element of the rotary electric machine according to the first embodiment.
  • FIG. 3 only a portion of a cross section perpendicular to the axial direction is shown.
  • all permanent magnets 22 shown in FIG. 1 adopt the substantially same constitution.
  • the permanent magnet 22 has a pair of magnetic pole faces 22 a 22 b both of which show arcs. Further, a radius R2 of the arc shown by the magnetic pole face 22 b away from the armature (not shown in the drawing: see FIG. 1 ) is larger than a radius R1 of the arc shown by the magnetic pole face 22 a close to the armature. A focal point P2 of the arc shown by the magnetic pole face 22 b is further away from the permanent magnet 22 than a focal point P1 of the arc shown by the magnetic pole face 22 a . In other words, the focal point P1 is closer to the permanent magnet 22 than the focal point P2. Further, the focal points P1, P2, and the rotation axis J are arranged on one straight line (indicated by a double-dashed chain line in FIG. 3 ).
  • the magnetic pole face 22 c and the radius R02 of the arc shown by the magnetic pole face 22 c shown in FIG. 2 are also indicated by a chain line in FIG. 3 .
  • the focal point P0, the radius R01, and the magnetic pole face 22 a in FIG. 2 respectively correspond to the focal point P1, the radius R1, and the magnetic pole face 2 a in FIG. 3 .
  • the thickness of the permanent magnet 22 is increased as leaving from the center portion of the arc, to be more specific, as the portion of the permanent magnet 22 is further away from a straight line which connects the focal points P1, P2 and the rotation axis J.
  • the permanent magnet 22 has a small thickness in the vicinity of the center of the arc, and has a large thickness at both ends of the arc.
  • the magnetic pole faces 22 a , 22 b of the permanent magnet 22 are concaved toward the armature 1 , and the thickness of the permanent magnet 22 is set thin in the vicinity of center of the arc while the thickness in the vicinity of end portions (that is, both ends of the arc) which are different from the magnetic pole faces 22 a , 22 b is set thick.
  • the permanent magnet 22 is hardly effected by the demagnetization caused by an armature magnetic field while increasing areas of the magnetic pole faces 22 a , 22 b . Further, the permanent magnet 22 is reduced in the volume and is effectively used.
  • Permanent magnets embedded in a field element 2 may be stacked on each other between a rotation axis J and an armature 1 .
  • FIG. 4 , FIG. 6 and FIG. 7 correspond to FIG. 3 , wherein the constitution where a plurality of permanent magnets 221 , 222 are layered is adopted.
  • FIG. 5 also corresponds to FIG. 3 , wherein the constitution where a plurality of permanent magnets 221 , 222 , 223 are layered is adopted. In this manner, by embedding permanent magnets in plural layers in a core 21 in a stacked manner, reluctance torque of a rotary electric machine is increased.
  • Magnetic pole faces similar to shapes as the permanent magnet 22 of the first embodiment are shown on all permanent magnets 221 , 222 , 223 .
  • the permanent magnet 221 has a pair of magnetic pole faces 221 a , 221 b both of which show arcs.
  • a radius R2 of an arc shown by the magnetic pole face 221 b away from an armature (not shown in the drawing: see FIG. 1 ) is larger than a radius R1 of an arc shown by the magnetic pole face 221 a closer to the armature.
  • a focal point P2 of the arc shown by the magnetic pole face 221 b is further away from the permanent magnet 221 than a focal point P1 of the arc shown by the magnetic pole face 221 a (in other words, the focal point P1 is closer to the permanent magnet 221 than the focal point P2).
  • a radius R4 of an arc shown by a magnetic pole face 222 b away from the armature is larger than a radius R3 of an arc shown by a magnetic pole face 222 a closer to the armature.
  • a focal point P4 of the arc shown by the magnetic pole face 222 b is further away from the permanent magnet 222 than a focal point P3 of the arc shown by the magnetic pole face 222 a (in other words, the focal point P3 is closer to the permanent magnet 222 than the focal point P4).
  • a radius R6 of an arc shown by a magnetic pole face 223 b away from the armature is larger than a radius R5 of an arc shown by a magnetic pole face 223 a closer to the armature.
  • a focal point P6 of the arc shown by the magnetic pole face 223 b is further away from the permanent magnet 223 than a focal point P5 of the arc shown by the permanent magnet 223 a (in other words, the focal point P5 is closer to the permanent magnet 223 than the focal point P6).
  • the focal points P1, P2, P3, P4, P5, P6 and the rotation axis J are arranged on one straight line (indicated by a double-dashed chain line in FIG. 4 and FIG. 5 ).
  • the permanent magnets 221 , 222 , 223 are hardly effected by the demagnetization caused by a magnet field of an armature while increasing areas of the magnetic pole faces. Further, respective the permanent magnets 221 , 222 , 223 are decreased in the volume and are effectively utilized.
  • FIG. 4 exemplifies the case where the focal points P1, P3 correspond, and the focal points P2, P4 correspond. However, as shown in FIG. 6 and FIG. 7 , these focal points may not correspond.
  • the focal point P1 may be further away from the rotation axis J than the focal point P3, or the focal point P2 may be further away from the rotation axis J than the focal point P4.
  • the permanent magnets 221 , 222 maintain the shapes where the thickness is thin at the center and is large at both ends, and so long as such shapes are maintained, it is possible to reduce required volumes of the permanent magnets while suppressing the effect of the demagnetization.
  • the permanent magnets 22 , 221 , 222 , 223 having shapes described in the first embodiment and the second embodiment can be formed by a known method, for example, using a resin magnet disclosed in Japanese Patent Application Laid-Open No. 11-206075 (1999) and Japanese Patent Application Laid-Open No. 2003-47212. With the use of the resin magnet, the permanent magnets 22 , 221 , 222 , 223 are easily formed in the core 21 by injection molding.
  • the resin magnet is also referred to as a bond magnet.
  • a magnetization magnetic flux supplied from the outside for forming the resin magnet be arranged parallel to a straight line on which the rotation axis J and the focal points P1, P2, . . . are arranged as viewed in the axial direction. It is for surely providing the magnetization in the vicinity of the center of the permanent magnet (that is, near the straight line).
  • the injection molded resin magnet has anisotropy where a magnetization easy axis of a resin magnet is directed in the thickness direction of the permanent magnets 22 , 221 , 222 , 223 .
  • a magnetization easy axis of a resin magnet which is adopted as the permanent magnet 22 be arranged perpendicular to the arc shown by the magnetic pole face 22 a of the permanent magnet 22 on an armature side. Since the resin magnet has such anisotropy, even when there is the disturbance in the magnetization magnetic flux, the residual magnetic flux density of the magnetic pole face 22 a on an armature side is increased and hence, a field magnetic flux is easily increased. The same goes for the permanent magnets 221 , 222 , 223 .
  • FIG. 8 shows the constitution of a rotary electric machine according to a fourth embodiment, and only a portion of the cross section perpendicular to the axial direction is shown.
  • a so-called outer-rotor-type rotary electric machine is described.
  • a field element 29 includes a core 219 and permanent magnets 229
  • an armature 19 includes teeth 119 and a yoke 139 .
  • the armature 19 is surrounded by the field element 29
  • the yoke 139 connects the teeth 119 on a rotation axis J side.
  • each permanent magnet 229 has a pair of magnetic pole faces 229 a , 229 b having an arc.
  • a radius R29 of an arc shown by the magnetic pole face 229 b away from the armature 19 is larger than a radius R19 of an arc shown by the magnetic pole face 229 a closer to the armature 19 .
  • a focal point P29 of the arc shown by the magnetic pole face 229 b is further away from the permanent magnet 229 than a focal point P19 of the arc shown by the magnetic pole face 229 a (in other words, the focal point P19 is closer to the permanent magnet 229 than the focal point P29).
  • the focal points P19, P29 and the rotation axis J are arranged on one straight line (indicated by a double-dashed chain line in FIG. 8 ). In this embodiment, the case where the focal point P19 correspond to the rotation axis J is exemplified.
  • the permanent magnet 229 is hardly effected by the demagnetization caused by a magnet field of the armature while increasing areas of the magnetic pole faces. Further, the permanent magnet 229 is decreased in the volume and hence, it is effectively utilized.
  • the permanent magnet 229 according to the fourth embodiment is also formed in the same manner as the injection molding of the resin magnet in the third embodiment.
  • FIG. 9 shows the constitution of a field element of a rotary electric machine according to the fifth embodiment.
  • FIG. 9 corresponds to FIG. 3 showing the first embodiment.
  • the case where the permanent magnet 22 has the uniform thickness is also described by a chain line.
  • the field element 2 (see FIG. 1 ) further includes magnetic barriers 23 formed on end portions of the permanent magnet 22 which are different from magnetic pole faces 22 a , 22 b .
  • the magnetic barrier 23 is a hole which penetrates in the axial direction, for example, and prevents a magnetic flux from flowing between the magnetic pole faces 22 a , 22 b of the permanent magnet 22 in a short-circuited manner.
  • the armature magnetic field flows through the magnetic barriers 23 more easily than the permanent magnet 22 .
  • a length 23 c of a portion which is formed by the magnetic barrier 23 at a position furthest away from an end portion of the permanent magnet 22 and a side surface 210 of a core 21 closest to the armature 1 (can be also regarded as a side surface away from the rotation axis J in the case of the inner-rotor-type rotary electric machine) be smaller than a width 22 d of the permanent magnet 22 .
  • the width 22 d is a width (thickness) of the permanent magnet 22 on a straight line which connects the rotation axis J and focal points P1, P2, and is a minimum value of the thickness of the permanent magnet 22 .
  • the permanent magnet 22 per se has magnetic permeability to an extent that the magnetic barrier 23 has. Accordingly, when the thickness of the magnetic barrier 23 is larger than the thickness of the permanent magnet 22 , the armature magnetic field avoids the magnetic barrier 23 and is liable to pass through the permanent magnet 22 . Particularly, the magnetic barriers 23 are provided to the end portions of the permanent magnet 22 where the demagnetization is to be taken into consideration and hence, it is not desirable that a magnetic resistance of the magnetic barrier 23 as a path of the armature magnetic field becomes higher than that of the permanent magnet 22 . This issue becomes apparent particularly when the rotary electric machine is in a stopped state.
  • the core 21 remains on a more armature 1 side than the magnetic barrier 23 with the length 23 c smaller than the minimum value (width 22 d ) of the thickness of the permanent magnet 22 .
  • a width 23 a of the magnetic barrier 23 on a permanent magnet 22 side is selected to be substantially equal to or more than a width of the permanent magnet 22 at both ends.
  • the thickness of the permanent magnet 22 at both ends is larger than the thickness 22 d at the center. Accordingly, the length 23 c becomes shorter than the width 23 a.
  • the magnetic barrier 23 can be also provided to end portions of the permanent magnet 229 which are different from the magnetic pole faces 229 a , 229 b are respectively formed according to the fourth embodiment.
  • a side surface 290 of the core 219 closer to the rotation axis J becomes a side surface closer to the armature 19 and corresponds to the above-mentioned side surface 210 .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
US14/406,970 2012-06-14 2013-06-12 Interior permanent magnet rotary electric machine Abandoned US20150171680A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2012-134450 2012-06-14
JP2012134450 2012-06-14
PCT/JP2013/066221 WO2013187439A1 (ja) 2012-06-14 2013-06-12 埋込磁石型回転電機

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US20150171680A1 true US20150171680A1 (en) 2015-06-18

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US14/406,970 Abandoned US20150171680A1 (en) 2012-06-14 2013-06-12 Interior permanent magnet rotary electric machine

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US (1) US20150171680A1 (ja)
EP (1) EP2863517A4 (ja)
JP (1) JP5701936B2 (ja)
CN (1) CN104350665A (ja)
WO (1) WO2013187439A1 (ja)

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CN106411008B (zh) * 2016-11-24 2019-06-21 东昌电机(深圳)有限公司 电动轮椅用的电机结构
JP7076733B2 (ja) * 2018-04-17 2022-05-30 株式会社ダイドー電子 永久磁石回転子および回転電気機械
CN109067038A (zh) * 2018-08-27 2018-12-21 珠海格力节能环保制冷技术研究中心有限公司 转子组件、电机和压缩机
CN109818441A (zh) * 2019-03-18 2019-05-28 东南大学 一种磁障式永磁磁阻同步电机转子结构
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JP7381914B2 (ja) * 2021-11-12 2023-11-16 ダイキン工業株式会社 回転子、モータ、圧縮機および空気調和装置

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